/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
package org.apache.qpid.server.logging;

import java.security.AccessController;
import java.security.Principal;
import java.util.Set;

import javax.security.auth.Subject;

import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.filter.Filter;
import ch.qos.logback.core.spi.FilterReply;
import org.apache.qpid.server.model.BrokerLogger;
import org.apache.qpid.server.virtualhost.VirtualHostPrincipal;

public class VirtualHostLogEventExcludingFilter extends Filter<ILoggingEvent> implements LogInclusionRule
{
    private final BrokerLogger<?> _brokerLogger ;

    public VirtualHostLogEventExcludingFilter(BrokerLogger<?> brokerLogger)
    {
        super();
        _brokerLogger = brokerLogger;
    }


    @Override
    public Filter<ILoggingEvent> asFilter()
    {
        return this;
    }

    @Override
    public String getName()
    {
        return "$" + getClass().getName();
    }

    @Override
    public FilterReply decide(ILoggingEvent event)
    {
        if (!_brokerLogger.isVirtualHostLogEventExcluded()  || !subjectContainsVirtualHostPrincipal())
        {
            return FilterReply.NEUTRAL;
        }
        return FilterReply.DENY;
    }

    private boolean subjectContainsVirtualHostPrincipal()
    {
        Subject subject = Subject.getSubject(AccessController.getContext());
        if (subject != null)
        {
            Set<Principal> principals= subject.getPrincipals();
            for (Principal principal: principals)
            {
                if (principal instanceof VirtualHostPrincipal)
                {
                    return true;
                }
            }
        }
        return false;
    }

}
